The ammunition is safe as long as the container is intact, according to the Air Force. Halverson said the ammunition won't operate in another device without "catastrophic failure." But people should evacuate and call first responders if the ammunition is located and found damaged.

Tribal staff were told about the missing explosives on Thursday, said Mark Fox, chairman of the Mandan, Hidatsa and Arikara Nation. The explosives were lost on the Fort Berthold Reservation.

"Being a veteran myself, I fully understand that accidents happen at any level," Fox said Monday. "But my hopes and prayers are that it is found soon somehow, to avoid any possible injury or tragedy."

The military has offered a $5,000 reward for information leading to recovery.

Every week, WildSafe B.C. posts a new video to its Facebook page to highlight a wild space in the B.C. Interior. This week, provincial WildSafe B.C. coordinator Frank Ritcey takes you on a grassland hike near Kamloops showin